Taylor Valve Technology 8300 S.W. 8 th St. Oklahoma City, OK 73128 Ph 405-787-0145 REV. A Fax 405-789-8198 EQUIPMENT OPERATIONS & MAINTENANCE RB Revamped-1 (RV1) Series Production Chokes Equipment Manual 1.0 SCOPE 1.1 Storage, installation, operating, and maintenance instructions and information for RB series production chokes. 2.0 GENERAL INFORMATION Chokes operate under high pressures. Release all pressure and isolate valve before installing or maintaining the valves. Follow instructions as listed. 2.0 Taylor Valve Technology’s RB series chokes are constructed upon the external sleeve and nozzle principle Whereby flow restriction is effected by the relative position of external sleeve to the nozzle. The nozzle has a series of circular ports through which the flow passes. The external sleeve overlaps the ports during linear movement of the stem and therefore flow is controlled by the restriction produced. When the stem has reached its full travel, the choke is then in a fully open position. A “dead band” is encountered during opening which is a result of the overlap from fully closed to initiation or port intersection. 2.1 The RB series choke is distinguished by a bolted bonnet to body connection and linear travel. The RB series is available in sizes from 2” to an 8” nominal, 0 – 10,000 psig working pressure configuration. End connections are available in NPT, or API LP internally threaded, ANSI flanged, API 6A flanged, welded or clamp hub. 3.0 STORAGE AND INSTALLATION 3.1 Chokes are shipped in the closed position with the end connections and other sealing surfaces protected with corrosion inhibitors and plugs or covers. This protection shall not be disturbed until the choke is ready to be installed. Care in handling shall be observed in order not to damage fittings, actuators, positioners, and other accessory components including data plates. Unless provisions for proper testing by qualified personnel are available, the choke shall not be disassembled for any reason. 3.2 The choke shall be installed in-line referencing the direction of flow mark(s) found on the body. Chokes may be Installed rotated any degree about the line axis as is convenient but under no circumstances shall a choke be installed contrary to the flow direction mark(s). Threaded connections shall receive a thorough inspection prior to makeup and any minor flaw addressed with a thread file or tap. A good grade of thread sealant such as API 5AC compound is recommended; however, if Teflon tape is applied, use one turn per joint and apply in the direction of the thread. Excessive wrapping with Teflon tape will result in the tape “bunching” and prohibiting proper makeup. Threaded joints should be made up power tight, but the use of “cheaters” and excessive torques should be avoided. 3.3 Flanged, welded or clamped connections shall receive a thorough inspection prior to makeup and any minor flaws addressed with a file or abrasive paper cloth. Bolts, nuts and gaskets should be of the proper size, quantity and grade for the application at hand. Do not attempt to omit bolts or use sub-size bolts or nuts. Lubricate ring grooves lightly with a good grade of petroleum oil but do not pack or fill groove as this will not permit proper gasket seating. Tighten bolting uniformly by addressing opposing bolts in a crossing sequence with loading applied incrementally. The gap between the flanges should be observed to determine if the flange faces are remaining relatively square and tightening adjusted accordingly. Do not over-tighten smaller bolts. 3.4 Welded end chokes, if not provided with extended inlets or outlets, shall be disassembled prior to preheat, welding, and post-heat operations to avoid thermal damage to internal components. Welding procedures and materials used shall be qualified and approved and shall be suitable for the materials to be joined. Upon reassembly, the choke shall be tested as described in Section 4.0 of this document.
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Taylor Valve Technology
8300 S.W. 8th St.
Oklahoma City, OK 73128
Ph 405-787-0145
REV. A Fax 405-789-8198
EQUIPMENT OPERATIONS & MAINTENANCE RB Revamped-1 (RV1) Series Production Chokes
Equipment Manual
1.0 SCOPE
1.1 Storage, installation, operating, and maintenance instructions and information for RB series production chokes.
2.0 GENERAL INFORMATION
Chokes operate under high pressures. Release all pressure and isolate valve before installing or maintaining the
valves. Follow instructions as listed.
2.0 Taylor Valve Technology’s RB series chokes are constructed upon the external sleeve and nozzle principle
Whereby flow restriction is effected by the relative position of external sleeve to the nozzle. The nozzle has a
series of circular ports through which the flow passes. The external sleeve overlaps the ports during linear
movement of the stem and therefore flow is controlled by the restriction produced. When the stem has reached its
full travel, the choke is then in a fully open position. A “dead band” is encountered during opening which is a
result of the overlap from fully closed to initiation or port intersection.
2.1 The RB series choke is distinguished by a bolted bonnet to body connection and linear travel. The RB series is
available in sizes from 2” to an 8” nominal, 0 – 10,000 psig working pressure configuration. End connections are
available in NPT, or API LP internally threaded, ANSI flanged, API 6A flanged, welded or clamp hub.
3.0 STORAGE AND INSTALLATION 3.1 Chokes are shipped in the closed position with the end connections and other sealing surfaces protected with
corrosion inhibitors and plugs or covers. This protection shall not be disturbed until the choke is ready to be
installed. Care in handling shall be observed in order not to damage fittings, actuators, positioners, and other
accessory components including data plates. Unless provisions for proper testing by qualified personnel are
available, the choke shall not be disassembled for any reason.
3.2 The choke shall be installed in-line referencing the direction of flow mark(s) found on the body. Chokes may be
Installed rotated any degree about the line axis as is convenient but under no circumstances shall a choke be
installed contrary to the flow direction mark(s). Threaded connections shall receive a thorough inspection prior to
makeup and any minor flaw addressed with a thread file or tap. A good grade of thread sealant such as API 5AC
compound is recommended; however, if Teflon tape is applied, use one turn per joint and apply in the direction of
the thread. Excessive wrapping with Teflon tape will result in the tape “bunching” and prohibiting proper
makeup. Threaded joints should be made up power tight, but the use of “cheaters” and excessive torques should
be avoided.
3.3 Flanged, welded or clamped connections shall receive a thorough inspection prior to makeup and any minor flaws
addressed with a file or abrasive paper cloth. Bolts, nuts and gaskets should be of the proper size, quantity and
grade for the application at hand. Do not attempt to omit bolts or use sub-size bolts or nuts. Lubricate ring
grooves lightly with a good grade of petroleum oil but do not pack or fill groove as this will not permit proper
gasket seating. Tighten bolting uniformly by addressing opposing bolts in a crossing sequence with loading
applied incrementally. The gap between the flanges should be observed to determine if the flange faces are
remaining relatively square and tightening adjusted accordingly. Do not over-tighten smaller bolts.
3.4 Welded end chokes, if not provided with extended inlets or outlets, shall be disassembled prior to preheat,
welding, and post-heat operations to avoid thermal damage to internal components. Welding procedures and
materials used shall be qualified and approved and shall be suitable for the materials to be joined. Upon
reassembly, the choke shall be tested as described in Section 4.0 of this document.
Taylor Valve Technology
8300 S.W. 8th St.
Oklahoma City, OK 73128
Ph 405-787-0145
REV. A Fax 405-789-8198
4.0 ON-SITE TESTING 4.1 Subsequent to any repair or maintenance operation which breaches the body and/or bonnet closures or pressure
boundaries, a hydrostatic test shall be performed. Testing shall be performed by qualified personnel.
4.2 Procedure:
4.2.1 Close upstream and downstream line valve(s) to isolate choke under test.
4.2.2 Open choke approximately halfway to perform a full body test or close choke fully to perform a seat
closure test. Note: power actuated chokes shall be operated in accordance to this document and the